Material handling apparatus



b- Z w57 F. J. SE1-1N Erm.

lvmirxsRIAI. HANDLING APPARATUS s Smets-sheet 1 Filed DeC. 27, 1955.

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iNVENToR Feb. E2, 1957 F. J. SE1-1N ETAL QSE MATERIAL HANDLING APPARATUSFiled Deo. 27,'1955 s sheets-sheet 2 Jz/PPA y Feb. 12%, w57

F. J. SEHN Ei' AL MATERIAL HANDLING APPARATUS Filed Dec. 27, 1955 3Sheets-Sheet INVENTORS' feAA/c/s J 55s/,v

nited States Patent 1 2,781,136 MATERIAL HANDLNG APPARATUS Francis 3.Selm, Detroit, and Maurice M. Clemons, Birmingham, Mich., assignors toPress Automation Systems incorporated, Detroit, Mich., a corporation ofMichigan Application December 27, 1955, Serial No. 555,413 7 Claims.(Ci. 214-1) The present invention relates to a material handlingapparatus for a press or the like machine, and more particularly to anapparatus for the handling of sheet metal and the like into or out of apress or a similar production machine.

In the interest of efficient and economical handling of materials to andfrom various production machines, and also for increased employeesafety, various types of material handling apparatus have been provided.This is particularly true in the handling of sheet metal to and from aproduction press or similar machine. The present invention provides animproved material handling apparatus which is adapted for such use.

One of the primary advantages of the present apparatus resides in itsadaption lto and convenient mounting upon or adjacent to a press or thelike. The entire handling apparatus of the present invention may bereadily suspended from a single supporting element, such as a bar orrod, the bar or rod either being positioned upon the press to projecttherefrom or being positioned adjacent the press.

Another advantage of the material handling apparatus of this inventionis that the apparatus is automatically operable through a predeterminedcycle to insert or remove material from the production machine. Inaddition, the device may be manually operated, if such is desired. Thecontrol apparatus for the device of this invention is quite simple inits construction and operation, preferably utilizing a pair ofpneuma-tic cylinders which are operated in predetermined sequence by thesubjection of the pneumatic actuating mechanisms to loads of diterentmagnitudes, thus limiting the need for expensive, complicated, andtroublesome pneumatic control mechanism. In fact, the apparatus of thepresent invention requires only a single actuating valve movable to twopositions to alternately advance and retract the mechanism, and a verysimple electrical control circuit which serves the sole function ofactuating the single control valve.

Other advantages of the apparatus of the present invention include theuse of fabricated sheet metal parts for the .supporting structure andthe frame of the apparatus, and the utilization of a simple double rackand single pinion change-speed drive ,for actuating the apparatus towardand away from the press or other production machine, thus greatlyincreasing the material handling efficiency and the production speed ofthe machine.

it is, therefore, an important object of the present invention toprovide an improved material handling apparatus for the insertion orremoval of sheet metal from a press or similar production machine,

Another important object of the present invention is the provision of amaterial handling apparatus for a production machine which is suspendedfrom a single supporting element forming a part of or placed injuxtaposition -to the production machine.

Another important object is the provision of an automatically ormanually operative material handling apparatus which is provided with asimplified, inexpensive, and trouble-free actuating mechanism.

A further important object is to provide an improved material handlingapparatus wherein a pair of fluid pressure cylinders are operatedsequentially by virtue of the load imposed upon the cylinder-actuatedparts and under the control of a single actuating valve. i

rice

Still another important object is the provision of an automaticallyoperative material handling apparatus in which a fluid pressure controlvalve is actuated by an electric circuit including a part actuated by apress or the like and through which a holding circuit fora valve isenergized, the holding circuit being interrupted upon the completion ofmovement of the fluid pressure actuated portion or" the apparatus,thereby actuating the valve to ei`- ect return movement of theapparatus.

it is yet another important object of this invention to provide animproved material handling apparatus wherein a double rack and singlepinion change-speed drive is utilized to increase the effective strokeand the operating speed of a lluid pressure cylinder which ysupplies thesource of power oir the apparatus.

Another and further important object -to the present invention willbecome apparent from a study of the drawings which are described indetail hereinafter and from the appended claims.

As shown in the drawings:

Fig. l is a side elevation of a material handling apparatos of thepresent invention particularly adapted for the retraction of nishedparts from a press or the like;

Fig. 2 is a fragmentary View similar to Fig. 1 illustrating theworkpiece-engaging portions of the apparatus in an adjusted position; Y

Fig. 3 is an enlarged end elevational View of the apparatus shown inFig. l;

Fig. 4 is a diagrammatic View of a typical control circuit utilizablefor either manual or automatic control of the apparatus;

Fig. 5 is a schematic representation of the pneumatic actuatingmechanism controlled by the circuit of Fig. 5;

Fig. 6 is an enlarged sectional View, with parts Shown in elevation,taken along the planes 6 6 of Fig. l;

Fig. 7 is an enlarged sectional view, with parts shown in elevation,taken along the planes 7-7 of Fig. l; and

Figs. 8, 9 and l0 are schematic views illustrating different modes ofadapting the apparatus to press.

On the drawings:

in Fig. l, reference numeral 15 referred generally to a materialhandling apparatus of the present invention.

The apparatus 15 includes a longitudinally extending sheet metal mainframe indicated generally at 16 and comprising a vertically extendingside plate 17 joining upper and lower laterally extending legs 18 and 19terminating -in vertically extending flanges 20 and 21, respectively.The upper lateral leg 18 is secured, as bywelding at 22, to a centrallylocated, upstanding attachment block 23 which is generally rectangularin shape and which has a cylindrical aperture 242V adapted to receivetherethrough a iixed mounting element 25 (Fig. 3). The block 23 forms asplit clamp Vand a plurality of clamping screws 27 are utilized tosecure the block 23 upon the mounting element 25 in secure assembly. Themounting block 2.3 is preferably located at the center of gravity of theassembly 15 (when the assembly is in the position shown in Fig. l) andthis, together with the clamping screws Z7, retain the mounting frame 16aga-inst tilting movement.

Secured to the under surface of `the leg 18 to depend therefrom are aplurality of longitudinally spaced hangers 2S which are centrallyapertured to receive therethrough a fixed slide shaft 3d (Figs. l, 6 and7). This shaft 30 support a longitudinally movable frame elementindicated generally at 3l and of the. same general shape as the xedframe 15. M ore particularly, the movable frame 31 includes a side plate32, upper and lower laterally extendling legs 33 and 34 respectively,and terminal vertically extending lianges 35 and 36. The upper surfaceof the leg 33`carries a slide block 37 apertured, as at 38, to tre- 3ceive therethrough a bearing bushingj39 surrounding the slid-e shaft 30.Y

VIt will besappreciated that provision of thebearing 39 and the block37, in combination with the shaft Sii, makes possible longitudinalrelative sliding movement between the fixed frame i6 and the slidingyframe 31. This relative longitudinal movement is guidedby an elongatedguide block dii'depending from' the Vlower lateral leg 19 of the frameelement 16 and contacted Vby a pair of rollers 41 carried Ybythe lowerleg 34 of the sliding'v frame 31 and laterally spaced to receive theguide block di? therebetween. The rollers 4l are secured to thesliding,V frame necessarily cause'longitudinal displacement of thepinion 76. This pinion '76, being meshed with the ixed rack 77,

Y will' be forced to rotate, and rotation ofthe pinion will effect aVcorresponding longitudinal displacement of the upper rack 3 which ismovable with the slide frmel relativeY to the fixed frame 16, suchmovement of the slide frame'being guided bythe shaft 3i) and the gui/deblock i Because ofthe pinion and rack arrangement, the

.371 by support blocks 42' underlying Ythe sliding frame andseeuredtheretorby suitable means, as by nuts 43..

Y YThe rollers 4l, in combination with the guide block 4G,

not onlyV guide the frame for longitudinal movement, but

prevent relative oscillating movement between the fixed frame 16 and thesliding frame 31 about the shaft 30.

The lower leg 34 of -thelsliding frame 3l has secured thereto, as Ybyscrews 44, an additional mounting block Y' Y45 which is'provided with acentral rectangular opening 46 through which a return cut-o5 cam 4.7projects. This cam 47 also projects between the roller mounting blocks42, as best shown in Figsg and6. The return cut-off cam 47 is providedat one end with a cam face 48 for a purpose to be hereinafter more fullydescribed, and a set screw VV49,VV manually operable through a handle49a, is carried by the blocl; 45 to accommodate longitudinal adjustrnentof the cut-oh cam 47 for a purpose Vto be herein'- after more fullydescribed, Q ilu advance of the block 45, the lower leg 34 of themovable frame element 31 has secured thereto, as by welding,

afsupport block Sxedly attached, by nuts and bolts Si. Y

Y Yor the like, toa second depending support block 32 (i3-lgs.

land 3). The second support'block 52 is provided with Ya xed'dependingange 53 which is attached, as by'a screw 54, to a' shaft block 55 havingan aperture 56 through which extends an additional slide'shaft 57.

The fixed slide shaft 57 isrsur'rounded by a tubular supporting collar58V movable :along the shaft 'toward an end stop-59, the' slide collar58 carrying l'with it a'lower forwardly'projecting, gripper frame 69having pivoted thereto, as by pivot 61, a vertically movable grippingarm 62, which terminates at its rear end in an upstanding cam projection63 Vand having at its Yforward end Va gripper Y Y iinger 64 whichis'cooperable with a dependingtixed grip-V Y per'projection 65 (Figs. land 2) for grasping a sheet" 'i I metal/press part therebetween. Theslide shaft vstop 59 is Y provided with a depending' stop portion 66which is coi operable withjthe rear "carni projection 63 on Vthe gripperarm 62 to move the gripping finger upwardly toward andintogclosely'spaced relationship Vto the gripperV proiectionV 65 whenthe element 60 is moved Yforwardiy with the slide SSon the shaft/57. Theforward or finger end of themarrn 1 6 2 is heavier than the rear or camlendk63 so that the arm i'sover-balancedV to its neutraler non-actuated'released A laterally projectie Vstop position illustrated in Fig. 1.pin 67 is carried by the plate 6- to prevent undesired pivoting movementofthe arm'beyond its released position. Y

To efect relative Vlongitudinal movement4 between the mounting frameMend/the slide frame 3i, a fluid pressure from the lower-leg 19 of thefixed frarne i6, fas upon a' A V,bracket 71" andY a pivot`pin 72. Thecylinder Vactuating rod'73 *(Fig., 6) Ais provided witha'rt'erminalYclcvis 74 (Fig.

i Q 1)Vcarryi'ng'an axle pin'75 'upon which is disposed a pinion 76. l Y.A Y

'Y Thispinion 76, as best shown'in TEig. 3, meshes with a4V Vfirst yoriixed rack '77( carried byY the lower legi? of the fixedfrarne 16, andVsimultaneously meshes withV an upperY movable rack 'which is carried bythe upper leg 33 of I upper rack 78, and the movable frame 3l w'ilibedisplaced through la distance equal to twice the displacement'VV lt willbe of the cylinder piston and actuating rod 73'. appreciated that thisgear speed increase will effect rapid 'longitudinal displacement of theVmovable framel and those' parts attached thereto and will increase theelectiv stroke of tbe actuating rod 73. Y Y

A second actuating cylinder 80 is provided to actuate Y' the grippingmechanism.V This cylinder 80 is supported in ixed position upon theslide shaft 57 through a mounting block Si, andthe actuating rod 32 ofthe cylinder Sii is connected to the gripper block 6% by suitable means,as by pin .$53. Gbviously, actuation of the cylinder 80 will ex#V tendthe actuating rod 82 thereof to project the gripping element 69forwardly to its position illustrated in Fig. '2V

of the drawings, wherein thecam portion 63 of the gripper 62 will abutthe stop 66, and the linger 64 will be moved upwardly into itsgrippingposition for cooperation with the iixed gripping projection 65.

Fluid pressure for actuating the cylinders 7d and lit)V is providedthrough a pair of conduits 85 and S6(Fig. 3) whichcomrnunicate with aconduit box S7 disposed upon the upper leg i3 of the xed frame 16, andfrom the con-` duitV box S7 through conduits 88 and 39 to a secondconduit box 96 mounted upon the upstanding leg 32 of the movable frame3i through a protective shield 93..' A sec,-

ond shield 92 is carried by the upper leg 18ct the iixedV frame i6.kFrom the second conduit box 9d, conduits 93 andf: lead to the cylinderSi).

The supply of actuating fluid to the cylinders 76 and is bestillustrated in the greatly simplified schematic sketch of Fig. 5,wherein it is seen that fluid is supplied from an air supply 95'througha pressure Vline 96 anda regulator valve 9S to a control'valve 1th?,actuatedV as iereinafter explained and effective to introduce iuid underA ressure to ,the opposite ends of the cylinders 7i) and Sil Vthrough apair of uid transmission lines 85 and S6. The

lines 35 and S6 branch, as at 85a and 35h, and arand 36b,tosupply fluidto the cylinders 701 Yand Su. Each or" 'Y the cylinders and Si) is thedouble ,acting type, and iluid ,Y introduced through the branchconduitsa' and 85h will serve to YactuateV theactuating rods 73;'ar1dV82 vof Vthecylinders in one direction, while fluid introduced throughthebranchV lines S6fzand 36h 'will serve to energize the cylinactuatedcylinder, preferablynpneurnatic, indicated gener.- K allyj'at70 isutilized. One end of the cylinder is supportedV tion as illustrated inFig-l. Y

' Y lf the valve 109 Werenow actuated'to interconnect the line 96 andthe line 36, lluid will be; introduced simultaneouslyrinto the conduits86a-andr86bfto subject both of lthe cylinders '70 andV 89 to uidpressure.

ders 7d and Sd. so 'as to move'tne actuating rods 73 and,

32, respectively, thereof, in the opposite direction.Y

. When thepneumatic system is in the condition lolf Fig, 5, andthepistons occupy'their relative positions as shown Y therein,'themachin-e is zat rest, both of the actuating rods v are retracted, themovable frame 3l isnt its furthest left Aposition'at whichVV it istelescoped within the fixed frame Vi6, and the 'actuating rod 82 is,telescoped Withinits cylinder S9 Vso that the gripping arm 62 is in itsreleased posi-V V However, due to the resistance of the much heaviermovable frame to i movement, and because Vof the gear'rsp'eedadvantageof the slide frame 3.1L vIt will be appreciated thatV actuation ofthecylinder70 will yrnoye the actuating rod 73 Ythereof f Y longitudinallyofjiae ered name 16.' ,such meyemenr win 2,781,1asj

nger into cooperative relation with the gripper stop 65. This movementcompletes the cycle of operation of the cylinder 80, and continuedmovement of the actuating rod will be impossible.

The resultant increased pressure within the cylinder 70 will causeactuation of the actuating rod 73 toward the right, that is to extendthe actuating rod and the pinion 76 toward the right, causing actuationof the slidable frame 73 toward the right or from its telescopedposition, thus retracting the movable frame and the gripping fingercarried thereby from the press or other production machine. Theworkpiece, thus will be drawn from the press toward the right. When theactuating rod 73 approaches its furthest extended position, thecondition of the valve 100 is reversed connecting the pressure line 96to conduit 85 and consequently to conduits 85a and 85h. The first resultwill be that the cylinder 80 will receive fluid under pressure at itslefthand end, retracting the actuating rod 82 into the cylinder to movethe gripping tinger toward the right away from the stop 66, theoverbalanced gripping arm will necessarily release the workpiece. Uponthe completion of movement of the actuating rod S2, pressure will buildup in the line 55:1 and will actuate the actuating rod 73 in a leftwarddirection, thus returning the slide frame 31 to its retracted positionillustrated in Fig. l. The machine thus returns to its inactive positionof Fig. l and the cycle of operation has been completed.

The means for actuating the valve 100 to cause this cycle of operationare schematically illustrated in the wiring diagram of Fig. 4, whereincurrent of the desired voltage and from a convenient source enters thecircuit through lead lines 101 and 102. A manual olf-0n switch 103 isprovided in the lead line 100 and branch leads 104 and 105 connect thelead line 101 to the opposite sides of a dual action selector switch106. When the switch 106 is in its auto position, indicating automaticoperation, the switch connects the line 105 to a line 107 which leads toa press switch S which is closed, to the position shown in Fig. 4,whenever the press operation has ceased and the press is open. When thepress is operating, or in its closed position, the switch 108 is open.

From the switch 108, a line 109 leads to a normally closed limit switch110 which is connected through a circuit relay 111 to the other leadline 102. The circuit relay 111 is effective to operate contacts 112connected to the lead line 101 through conductor 113 and through thecoil windings 114 of a solenoid having a coil 115, to the other leadline 102. The solenoid core 115 actuates the valve 100, when thewindings 114 are energized, and

the solenoid core 115 moves the valve 100 to its position tointerconnect the iluid lines $6 and S6, as hereinbefore described. Whenthe solenoid windings 114 are deenergized, the valve 100 is moved to itsposition preferably under spring load to interconnect the pressure line96 and the iuid flow line 85. Thus, when the circuit of Fig. 4V is setfor automatic operation, as illustrated in Fig. 4, and the press is openso as to close the switch 108, the solenoid windings 114 will beenergized, the valve 100 will Ybe moved to its position to actuate theapparatus to retract a workpiece from the press.

Further, it will be noted that the relay 111 and the contacts 112 inelect form a holding circuit to retain the solenoid energized eventhough the switch 10S may be opened by the return of the press to itsactuated or closed position. This holding circuit is completed from thelead line 101 through a conductor 117 and additional relay contacts 116which, through a conductor 118, by-passes the press switch 108 to retaincurrent ow through the relay 111 and the limit switch 110. However, uponopening of the limit switch 110, the relay 111 is deenergized, thecontacts 112 will be opened, the solenoid windings 114 will bede-energized and the solenoid core 115 will return to position valve 100in such a manner as to interconnect the lines 96 and 85.

This limit switch 110 is carried by the fixed frame 16 and is indicatedgenerally at in Fig. 1. The limit switch 110 has an actuating arm 110:1which is adapted to be abutted by the return cut-oli cam 48 when thecarriage or movable frame member 31 approaches its fully extendedposition. The opening of the switch 110 will de-energize the solenoidwindings 114 as hereinbefore described, and the press material handlingapparatus will be Vreturned to its position in Fig. 1, as hereinbeforedescribed.

For manual operation, the switch 106 is merely actuated to close thecircuit between branch line 104, and conductor 120 which passes througha push-button switch 121 and a conductor 122 to the limit switch 110 andthe relay 111 as hereinbefore described. Thus, the manual operationmerely by-passes the press switch 108, and the same cycle will beperformed as hereinbefore described, with the exception that the cyclewill be manually initiated.

It will thus be appreciated that the present invention provides a newand novel material handling apparatus for a press or a similarproduction machine. Although the specific embodiment of the inventionillustrated in the drawings shows an apparatus for removing workpiecesfrom a press, it would be appreciated that the same principles may beapplied and the same structure utilized for the feeding of parts to apress or similar machine.

The extreme simplicity of the control mechanism for the device of thepresent invention will be readily evident. The utilization of a simplehydraulic control valve, and the extremely simple control circuit whichis provided for the control of this valve result in an inexpensive,extremely simple, practically foolproof construction.

The advantages of suspending the entire apparatus from a single overheadsupport will be readily appreciated by those skilled in the art, andthese advantages are specically illustrated in Figs. 8, 9, and l0. InFig. 8, the device is suspended independently of a press P by supportingthe support element 25 upon a pair of uprights or stanchions 125displaced to either side of a conveyor C and, if desired, forming a partof the conveyor supporting structure. In Fig. 9, the device isillustrated as being supported upon an arm 126 extending laterally fromthe press P and carrying the support member 25 in such manner as todispose the device 15 over the conveyor belt C. In Fig. 10, the device15 is supported upon an overhead arm 127 depending from an upwardportion of the press P and eiective to dispose the device over theconveyor belt C. In each of the Figs. 8-10, inclusive, the device isshown schematically with the gripping mechanism extending into the pressin position to retract a workpiece therefrom. Retraction of the grippingmechanism and the release thereof will deposit the workpiece upon theconveyor belt C for removal from the press location.

Another important advantage resides in the use of the stamped slides 16and 31. The relatively light slidesV reduce the inertia factor so thatthere is no substantial inertia load imposed upon the pneumaticactuating system either in starting or stopping relative movment ateither end of the stroke. This low inertia factor will be particularlyappreciated by those skilled in the art and familiar with the graveinertia problems involved in the actuation and use of the prior artdevices using massive and heavy cast or fabricated structural elements.

While a preferred embodiment ot' my invention has been disclosed anddescribed above in detail, it will be understood that numerousmodicationsmight be resorted to without departing from the scope of myinvention as defined in the following claims.

We claim:

l. A handling apparatus for sheet material or the like comprising a xedframe, a movable frame carried by said ixed frame for relativetranslatory movement, a carrier frame carried by said movable frame forrelative translatory movement and having means for engaging a'workpiece,change-speed gearing means interconnecting said', fixed Yframe and saidmovable frame, first uid pres- Vsure operated actuating means forenergizing saidV gearing means to effect relative movement between saidmovable rame and said'fixed frame, second iiuid pressure operatedactuating means for effecting relative movement between said carrierframe and said movable frame, and

actuatingl meansfor effecting relative teiescopic movement of saidelements in either direction, work piece engaging; meansV guided by oneof said elements for reciprocatory mcvementrrelative thereto, secondactuating means for effecting relative movement of said engaging meansand saidrone element, and control means for said actuating meansincluding a control valve and valve operating means responsive torelative movement of Vsaid eie-v rnents inY one direction to move thevalve soY that the dieringeiiective loads on Vthe actuating means willcause j actuation ofsaid second actuating means and then of said Y Vtrolmeans for sequentially operating said first and second actuating means,said rst actuating means being subjected to -an effective working loadsubstantially greater than that to Vwhich the second actuating means isYbecause of the presence of said overspeed gearing,V whereby uponYthesubjection or both actuating means to the same pressure, the secondactuating means'initially moves the gripping means toward the press andthe first actuating means then relatively retracts the elements from thepress.

4, A handling apparatus for sheet material or the like comprising afixed frame, a movable frame carried by said fixed frame for relativetranslatory movement, a carrier frame'carried by said movable franeforrelative transla- Ytoryrnovement and having/means for engaging -a workpiece,ioverspeed gearing'interco'nnectinU said fixed trameY and saidmovable frame, iirst fluid pressure operated actu` working plane of thepress, and reciprocation of said'engaging means withrrespect to said`other element effecting selective engagement and release of a Work pieceby said means, and separately energizable actuating means for eiectingmovement of said other of said elements and said engagingmeansrespectively, said actuating meansrmcluding an overspeed 'gear sethaving a reaction member on said one element, anl output member Yon saidother ele- Vment, ,and an input member interposed between the reactionmember and the output member vfor engagement.

' Y therewith, iirst duid pressure means for operatingsa'id inputmember, second fiuid pressure means for reciprocating said Vengagingmeans, and a control valve for vent- 4ing pressure Viiuid to said iirstand second iluid pressure means,Y said second iiuid pressureV meansbeing iirst actu'- ated dueto the interposing of said overspeed gear'setbetween said first iiuid pressure means and said other element.

`6. A handlingapparatus for sheet material or the likev comprising afixed frame, a movable frame carried by the.

tory movement and, having means'for engaging a work piece, overspeedgearing including a reaction gear on said iixed frame, an output gear onsaid movable frame, and an input gear interposed between the reactionand the output gears, first fluid pressure operated actuating means forenergizingl said input gear to effect relative Vmovement between Saidmovable frame and said xed frame VatV arnechanical disadvantage becauseof said overspeed gearing, second fluid pressure operated actuatingmeans for effecti ing relative movement between said carrier frame andsai-d movable frame, and control means for said iirst and secondactuating means including Ya source of fluid pressure and a valveinterposed between the source and both of said actuating means, saidsecond actuating means being first actuated due to said overspeedgearing to eiiect relative movement between the carrier frame and themovable frames, and the iirst actuating means being actuated only afterthe relative carrier frame and movable frame movementis complete. ,Y Y K7. YAn apparatus for; handling a workpiece for` a press or the likecomprising a pair of relatively telescopically movable elements, Workpiece engaging means guided by oneV of Ysaid elements/for relativeVtranslatory movement, first telescopic pistonV and cylinder means, anYoverdrive gear set actuated by the firstpistonsand,cylinder means andincluding an output gear on one of said elements, a

V ,reactionV gear Von Vthe other element, and an input gear ating meansfor energizing -said gearing means to etie'ct j relative movementbetween said movable trame and saidYA fixed irar'nerat the mechanicaldisadvantage ofsai-dV over?V Y speed gearing,V second uid pressureoperated actuating means for'efiecting reia'tive movement between saidcarrier frame and said movable frame, 'and a control valve forsimultaneously introducing fiud from a source of iiuid .pressure intoboth of said actuating means, saidV second actuating means being iirstactuated because of'the'lighter V Y rocable with respect to the oneelement and the press in Y a planeV substantially parallelsto theworking plane of Ythe press, workV piece engaging means carried byrsaidotherV *Y creto and i for movement therewith in substantialiytheworking, plane element ferire iprocatory'movement relative t ofthepress, reciproca-.tion ot'sai-d engaging'meansV with i Y saidptlierelement bodily displacingV a work piece in the I driven by saidV iirstpiston and cylinder means, a second teiescopic pistonV and cylinder'meansV connected between Y said one element andsaidlengaging means', andcontrol,

Ymeans Vincluding `a control valve movable to a pair of positions andinterposed between a source'ofluid'pressure and both of said pistonYandcylindervmeans,V and valvek movable only after completion ofmovement ofthe 'sec-V Y ond piston and cylinder'means when thevalveisfmoved Y to either of its positions;

References Citedlin the nleof'this patentY l Y,

v UNITED STATES PATENTS'.

Y394,42) 'W'llman Y Di.Y 111J 1888 412,85l Kennedy et al. 'OC. Yl5,15879Vv Y479,883 VStainesY Y 1892*V VSGP/,(118 Y Keily A Y y 1905 f1,550,997V Lacke Aug.'25, 1925 x 2,324,817 Blaley 'Y y v k1943 s2,609,775 saam 'sept;9, 19522 2,725,154 Hendricks .Nev. 29, v1;"55

Sahlin Y Y sept. is, `Y1956' s

